JPH08229587A - Activated sludge treatment device for domestic animal dung and installation method therefor - Google Patents

Abstract

PURPOSE: To effectively utilize domestic animal waste and to simultaneously attain pollution control and cost reduction. CONSTITUTION: This activated sludge treatment device for domestic animal dung is constituted by forming feed storage containers made of FRP as spareaeration tanks 3a to 3c, embedding the lower parts of these spareaeration tanks into a foundation 15 and connecting the spareaeration tanks via selector valve 11b rods to the existing aeration tanks by pipes. The constitution obtd. by using the plural feed storage containers made of the FRP as main aeration tank and spareaeration tanks, embedding the lower parts of the main aeration tank and the spareaeration tanks into the foundation and connecting these tanks via the selector valve 11b by the pipes is equally well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an activated sludge treatment device for livestock excrement for treating livestock excrement by the activated sludge method.

[0002]

2. Description of the Related Art Conventionally, livestock excrement discharged from a large-scale management barn has been treated by an activated sludge method. The activated sludge treatment device is made of concrete and has a constant volume and is fixed to the foundation. Livestock excrement is sent to an aeration tank through a settling tank, and in the aeration tank, seed sludge containing a large amount of aerobic microorganisms called activated sludge is sufficiently mixed with manure to be treated, and the transit time is 16 to 24 hours. Aeration is performed to remove organic substances contained in manure by oxidative decomposition, cohesive adsorption and precipitation. The mixed liquid after aeration is allowed to settle in a sedimentation pond and is discharged as the supernatant liquid purified water.

[0003]

However, when the number of heads increases due to the increase in production, the load factor of the activated sludge treatment device becomes high, and the minimum passage time of 16 hours cannot be maintained, and the function of activated sludge bacteria deteriorates. , The purification rate deteriorates and causes water pollution. Further, there is a demerit that the construction cost is high when a new activated sludge treatment device is installed. Further, although there is an existing activated sludge treatment device, if it is desired to increase the number of breeding heads due to changes in the livestock management environment, it may be costly to add an aeration tank and it may be difficult to add it in place. Moreover, although the amount of aeration varies depending on the season, it cannot cope with the variation in the amount of aeration.

On the other hand, when reducing the scale of livestock management,
The FRP feed storage container is no longer needed, but disposal of it causes pollution, which has been a problem for its treatment.

In view of the above, it is an object of the present invention to provide an activated sludge treatment device for livestock excrement, which makes effective use of livestock waste and simultaneously reduces pollution and cost.

[0006]

According to the present invention, a feed storage container made of FRP is used as a preliminary aeration tank, the lower portion of the preliminary aeration tank is buried in a foundation, and the preliminary aeration tank is aerated by a pipe through a switching valve. It is an activated sludge treatment device for livestock excrement characterized by being connected to a tank. Further, the present invention uses a plurality of FRP feed storage containers as a main aeration tank and a preliminary aeration tank, burying the lower parts of the main aeration tank and the preliminary aeration tank in a foundation, and connecting them by a pipe through a switching valve. It is an activated sludge treatment device for livestock excrement characterized by the fact that The present invention also cuts the FRP feed storage container and the lower end of the support leg to separate the main body, provides a window on the upper part of the main body, and buries the lower part of the main body in the foundation, and uses the main body as a preliminary aeration tank, This is a method for adding an activated sludge treatment device for livestock excrement, which is characterized in that the main body is connected to an existing aeration tank by a pipe through a switching valve and added. Further, according to the present invention, a plurality of FRP feed storage containers and supporting legs are cut at their lower ends to separate the main body, a window is provided at an upper portion of the main body, and a lower portion of the main body is embedded in a foundation so that the main body is The method for installing an activated sludge treatment device for livestock excrement is characterized in that an aeration tank and a preliminary aeration tank are connected by a pipe through a switching valve.

[0007]

[Function] The installation cost can be reduced to less than one-third and the aeration tank can be flexibly expanded or removed according to the increase or decrease of the management scale while also processing the waste that causes pollution. By doing so, even if the number of breeding heads is reduced, it can be dealt with.

[0008]

EXAMPLE An activated sludge treatment device for livestock excrement according to an example of the present invention will be described below with reference to FIGS. FIG.
~ FIG. 3 shows the activated sludge treatment device 1 of the first embodiment, and FIG.
The unnecessary 5 ton FRP feed storage container 2 having the appearance as shown in FIG. 2 is utilized as the preliminary aeration tank 3 and is additionally installed in the existing activated sludge treatment device 4. It aims to use what is generated as waste when a small-scale livestock farmer discontinues its business. 4 and 5 show
This is an activated sludge treatment device of the second embodiment, and a novel activated sludge treatment device is constructed by using an unnecessary feed storage container 2 having an appearance as shown in FIG. 6 as a construction material.

1 to 3 illustrate an activated sludge treatment device 1 of the first embodiment. FRP feed storage container 2 of FIG.
Is for storing livestock feed inside, and its structure and the like will be described later. The preliminary aeration tank 3 is composed of a preliminary aeration tank 3a and a preliminary aeration tank 3b which are connected in series, each of which is a processed FRP feed storage container 2 for treating manure of 50 pigs. It was added to. The existing activated sludge treatment device 4 is a concrete cube-shaped container, which is partitioned into a plurality of compartments, and is installed to treat manure of 200 pigs. A total of 250 manure can be processed. The existing activated sludge treatment device 4 is partitioned into a raw water tank 5, a pre-sedimentation tank 6, an aeration tank 7, a precipitation tank 8, a disinfection tank 9, and a concentration tank 10. The raw water tank 5 receives the feces and urine from the barn once and sends it to the pre-sedimentation tank 6 by a pump (not shown). The pre-sedimentation tank 6 is for precipitating before the aeration. The pipe from the pre-precipitation tank 6 is branched, one of which is connected to the aeration tank 7 via a ball valve 11a and to the preliminary aeration tank 3a via a ball valve 11b. The preliminary aeration tank 3a is connected to the preliminary aeration tank 3b,
The preliminary aeration tank 3b is connected to the preliminary aeration tank 3c. The preliminary aeration tanks 3a to 3c are arranged parallel to the short sides of the existing activated sludge treatment device 4, and perform aeration at the previous stage of the main aeration by the aeration tank 7. The aeration tank 7 is divided into two sections. A settling tank 8 is provided at a corner of the existing activated sludge treatment device 4, and the treated water aerated in the aeration tank 7 is settled. The disinfecting tank 9 adjacent to the settling tank 8 receives the supernatant of the settling tank 8, disinfects it, and then discharges it to the river. The thickening tank 10 is provided adjacent to the raw water tank 5, is supplied with the returned sludge from the settling tank 8, is concentrated therein, and is then again preliminarily aerated tank 3
a to the preliminary aeration tank 3c.

The preliminary aeration tank 3 shown in FIGS. 2 and 3 will be described. The preliminary aeration tank 3 is the FRP feed storage container 2 of FIG.
Is cut at the lowermost end, is formed into a cylindrical shape as a whole, and is supported by support legs 12. The upper curved surface of the preliminary aeration tank 3 has a fan-shaped skylight 13a for internal monitoring / maintenance. -A skylight 13c is provided. Also, a reinforced concrete foundation 15 whose lower end portion 14 is indicated by a chain double-dashed line
It is buried in. The height of the buried portion is half the height of the lower portions (inclined portions) of the preliminary aeration tanks 3a to 3c. Slightly from the bottom hole,
Concrete has entered and fixed inside the preliminary aeration tank 3. This is because if most of the preliminary aeration tank 3 is buried, the preliminary aeration tank 3 will be crushed by external pressure when the preliminary aeration tank 3 becomes empty. The preliminary aeration tank 3a and the preliminary aeration tank 3b are connected by a connecting pipe 16a.
b and the preliminary aeration tank 3c are connected by a connection pipe 16b, the connection pipe 16c extends from the preliminary aeration tank 3c, and the treated water flows from the preliminary aeration tank 3a to the preliminary aeration tank 3c. A defoaming nozzle 17 is provided in the vicinity of the central portion of the skylight 13 so that the bubbles generated on the surface of the sewage can be erased by spraying water. Defoaming nozzle 17
With the installation of (1), bubbles do not obstruct the contact between the liquid surface and the atmosphere, and oxygen in the atmosphere can be sufficiently dissolved in the sewage. The defoaming nozzle 17 is connected to the supply pipe 18. Air blower 2 for reinforced concrete foundation 15
0 is fixed, a vertical pipe 23 extends from the skylight 13 through a pipe 21 and a ball valve 22, and a diffuser 24 is provided at the tip. Diffuser 24
The (air diffuser) is disc-shaped and has a large number of holes formed from 360 degrees, and the air blown from the air blower 20 is ejected from the holes into the waste water and diffused so that aeration is performed. Has become. The diffuser 24 is provided eccentrically from the center, and prevents sewage from passing through.

Next, the installation of the first embodiment will be described. The FRP feed storage container 2 of FIG. 6 is cut along the arrow X to cut off the lower part. The skylight 13 is cut out, and the lower end portion 14 is embedded at a predetermined position of the reinforced concrete foundation 15 shown in FIGS. Figure 6
The component configuration of the FRP feed storage container 2 will be described. The FRP feed storage container 2a made of FRP has a cylindrical shape with an inclined lower end, and the FRP feed storage container 2b, FR
The P feed storage container 2c is provided, and the FRP feed storage container 2d and the FRP feed storage container 2e are wound. The lower ends of the four steel support legs 12 of the FRP feed storage container 2 are fixed to the reinforced concrete foundation 85, and the support legs 12 and the FRP feed storage container 2 are provided.
d, the feed storage container 2e made of FRP is connected. FR
An FRP feed storage container 2f is provided at the lowermost end of the P feed storage container 2a, and the FRP feed storage container 2 is made of FRP.
g is provided vertically so that the filling degree of the feed can be visually confirmed. Further, the FRP feed storage container 2h is vertically provided on the surface of the FRP feed storage container 2a, and the FRP feed storage container 2i is connected to the FRP feed storage container 2h. The FRP feed storage container 2j is detachably attached to the FRP feed storage container 2a, and the FRP feed storage container 2k is detachably attached to the FRP feed storage container 2m of the FRP feed storage container 2j. . The FRP feed storage container 2n is attached to the FRP feed storage container 2j.

Next, the operation of the first embodiment will be described. When the amount of treated sewage increases, the ball valve 11a is closed and the ball valve 11b is opened to perform preliminary aeration and main aeration in order to secure the passage time.
When a is opened and the ball valve 11b is closed, preliminary aeration is not performed and only main aeration is performed. Since the amount of dissolved oxygen in sewage decreases in summer and the amount of dissolved oxygen increases in winter, the operating time can be adjusted by a time switch or the like.

As described above, according to the first embodiment,
The passage time can be secured at 16 to 24 hours, and the purification efficiency is optimized. Sewage contains ammoniacal nitrogen. If the passage time is short, it becomes anaerobic, and the ammoniacal nitrogen is not sufficiently changed to nitrite nitrogen, which is not preferable. When the passage time is suitable (16 to 24 hours), oxygen is sufficiently mixed to become aerobic, and ammoniacal nitrogen is changed to nitrite nitrogen, which is suitable for breeding activated sludge. However, when the passage time becomes long, the nitrite nitrogen is changed to nitrate nitrogen that neither oxidizes nor reduces, nitrogen gas is generated, and sludge is lifted, which is not preferable.

It is possible to effectively use the site with less installation than adding an existing one. Since it is an aeration tank made of FRP and chemically stable without corrosion, it does not adversely affect sewage as in the case of a metal wall. FR
Since the aeration tank made of P is lightweight, it is easy to change the design, and at the time of transportation, the lid can be removed and multiple layers can be piled up, and many can be transported at one time, which also contributes to reduction of transportation cost. You can

The activated sludge treatment device 31 of the second embodiment will be described with reference to FIGS. 4 and 5. Although the second embodiment has the same technical idea as the first embodiment, it is a case where an activated sludge treatment device is newly installed from the beginning, and not only the preliminary aeration tank 3 but also the existing activated sludge treatment device 4 is FRP feed. It is configured by the storage container 2. The connection between the preliminary aeration tank and this aeration tank is slightly different. Raw water tank 35, pre-sedimentation tank 36, aeration tank 3
7, the settling tank 38, the disinfection tank 39, the preliminary aeration tanks 33a to 33c and the aeration tanks 37a to 37c are connected by connecting pipes 60 to 70 as shown in FIG. The raw water tank 35 receives the feces and urine from the barn once and sends it to the pre-sedimentation tank 36 by a pump (not shown). The pre-sedimentation tank 36 performs sedimentation on the preliminary floor of aeration. Pipes 62 and 63 are branched from the aeration tank 37a, and the ball valve 41
a and a ball valve 41b are provided. Ball valve 41
It is connected to the aeration tank 37b via a, and the ball valve 4
It is connected to the preliminary aeration tank 33a via 1b. The preliminary aeration tank 33a is connected to the preliminary aeration tank 33b, the preliminary aeration tank 33b is connected to the preliminary aeration tank 33c, and the preliminary aeration tank 33 is connected.
c is connected to the aeration tank 37b through the raw water tank 56.
The preliminary aeration tank 33a to the preliminary aeration tank 33c are the aeration tanks 37a to 37a.
It is arranged in parallel with the aeration tank 37c, and the aeration tanks 37a ...
The aeration in the preliminary stage of the main aeration by the aeration tank 37c is performed. The settling tank 38 is for precipitating the wastewater aerated in the aeration tank 37c. The disinfection tank 39 adjacent to the settling tank 38 receives the supernatant of the settling tank 38, disinfects it, and then discharges it to the river. The sludge returned from the settling tank 38 passes through the air lift pump 42 and the connecting pipe 70 and is fed back to the previous settling tank 36, and is again aerated by the preliminary aeration tank 33a to the preliminary aeration tank 33c and the aeration tanks 37a to 37c. It has become so. Pre-aeration tank 3
3a-preliminary aeration tank 33c and aeration tank 37a-aeration tank 37c
Has the same structure as that of the aeration tank 3 of the first embodiment and has the same structure as the defoaming nozzle 17 to the diffuser 24 of the first embodiment, but the illustration and description of the numbers will be omitted.

Next, the installation of the second embodiment will be described. The FRP feed storage container 2 of FIG. 6 is cut along the arrow X to cut off the lower part. Cutting out the skylight and burying the lower end portion at a predetermined position of the reinforced concrete foundation in FIGS. 4 and 5 is the same as in the first embodiment. The arrangement shown is only an example.
Since the arrangement can be flexibly arranged according to the situation, the empty space can be effectively used.

Next, the operation of the second embodiment will be described. Since the operation of the second embodiment is almost the same as the operation of the first embodiment,
The explanation will be simplified. When the amount of treated wastewater increases, the ball valve 41a is closed to secure the passage time.
As in the first embodiment, when b is opened, preliminary aeration and main aeration are performed, and when the amount of treated sewage decreases, the ball valve 41a is opened and the ball valve 41b is closed, and preliminary aeration is not performed. The amount of dissolved oxygen in sewage decreases in the summer and the amount of dissolved oxygen increases in the winter, so that the operating time can be adjusted by a time switch or the like as in the first embodiment.

The preferred embodiment of the present embodiment has been described above, but the present invention is not limited to the above embodiment,
It goes without saying that many modifications can be made without departing from the technical idea of the present invention. Those skilled in the art can naturally change the position, interval, and number of preliminary aeration tanks as appropriate. In addition, although three preliminary aeration tanks are connected in series, one preliminary aeration tank and two preliminary aeration tanks are used depending on the number of breeding animals.
It is naturally possible for those skilled in the art to connect them in parallel so that either one or three tanks can be selected.

[0019]

As described above, the installation cost can be reduced to one third or less while the disposal of waste that causes pollution can be performed, and the aeration tank can be flexibly expanded to accommodate the increase or decrease of the management scale. By responding or by removing the aeration tank,
The number of headed animals can be reduced, the amount of manure can be reduced, and maintenance is easy. Further, the adjustment of the air amount is easy, and it is possible to cope with the fluctuation of the processing amount. Furthermore, the space can be effectively used.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is a right side view of the preliminary aeration tank of the first embodiment.

FIG. 3 is a plan view of the preliminary aeration tank of the first embodiment.

FIG. 4 is a plan view of a second embodiment.

FIG. 5 is a front view of the second embodiment.

FIG. 6 is a front view of a feed storage container.

[Explanation of symbols]

 1,31 Activated sludge treatment device 2 FRP feed storage container 3a-3c, 33a-33c Preliminary aeration tank 4 Existing activated sludge treatment device 5,35 Raw water tank 6,36 Pre-precipitation tank 7,37a-37c Aeration tank 8,38 Settling tank 9,39 Disinfection tank 10 Concentration tank 11a, 11b, 41a, 41b Ball valve 12,42 Support leg 42 Air lift pump 13,43 Skylight 14,44 Lower end part 15,85 Reinforced concrete foundation 16, 60-70 Connection pipe 17 Extinguished Foam nozzle 18 Supply pipe 20 Air blower 21 Piping 22 Ball valve 23 Vertical pipe 24 Diffuser

Claims (4)

[Claims] 1. A feed storage container made of FRP is used as a preliminary aeration tank, a lower portion of the preliminary aeration tank is buried in a foundation, and the preliminary aeration tank is connected to an existing aeration tank by a pipe through a switching valve. Characterized activated sludge treatment device for livestock excrement. 2. A plurality of FRP feed storage containers are used as a main aeration tank and a preliminary aeration tank, and the lower portions of the main aeration tank and the preliminary aeration tank are embedded in a foundation, and they are connected by a pipe through a switching valve. An activated sludge treatment device for livestock excrement characterized by the fact that 3. A FRP feed storage container and a support leg are cut at their lower ends to separate the main body, a window is provided at the upper part of the main body, and the lower part of the main body is embedded in a foundation, and the main body is used as a preliminary aeration tank. An additional method for an activated sludge treatment device for livestock excrement, characterized in that the main body is connected to an existing aeration tank by a pipe via a switching valve and added. 4. A plurality of FRP feed storage containers and supporting legs are cut at their lower ends to separate the main body, a window is provided at an upper portion of the main body, and a lower portion of the main body is embedded in a foundation, and the main body is mainly aerated. A method for installing an activated sludge treatment device for livestock excrement, which comprises a tank and a preliminary aeration tank, which are connected by a pipe through a switching valve.